MARINE MOLLUSKS — MACGINITIE 119 



postnuclear whorl increases very little, the next sliglitly more, and 

 the next still more, but the increase is not rapid. 



Spiral lirations, varying from faint to strong, are present on the last 

 whorl and sometimes on earlier whorls. The large empty shell from 

 453 feet (pi. 12, fig. 1), which conforms with the type of B. beringi 

 figured by Middendorff (1849c and 1949d, pt. 2, figs. 5, 6), has been 

 tunneled by other animals and is practically covered with colonies 

 of bryozoans, but in one bare spot four faint lirations are visible on 

 the last whorl and at least two on the next to the last whorl. Without 

 the nucleus, this shell has about 5.5 moderately convex whorls, the 

 last increasing more rapidly than the others, mth 9 longitudinal 

 waves on the next to the last whorl. I believe that only in young 

 specimens or specimens that have been worn smooth would Dall's 

 statement that "F. beringi is absolutely smooth, except at the canal," 

 hold true. Often specimens of var. kobelti have lirations as faint as 

 those of true B. beringi. 



The thin, straw-colored to olive-tan periostracum sometimes covers 

 practically the entire shell, sometimes it is lacking entirely, but more 

 often, even in immature specimens, it is present in patches, the last 

 whorl usually being more thoroughly covered than the others. 



Distribution: Point Barrow to Nunivak Island and the Shuma- 

 gins. The var. kobelti is new to Arctic Alaska. Four specimens of 

 var. kobelti from the beach near Icy Cape and a juvenile from between 

 Cape Lisburne and Cape Beaufort have apparently not been recorded 

 in the literature; nor, apparently, have two young specimens of 

 B. beringi from the Shumagins, a large one from Pavlov Bay, and a 

 large shell from the beach at Point Barrow. 



Genus Colus Kbding, 1798 



Colus spitzbergensis (Reeve, 1855) 



Fusus spitzbergensis Reeve, 1855, p. 395, pi. 32, fig. 6. 

 Colus spitsbergensis Oldroyd, 1927, pt. 1, p. 212, pi. 4, fig. 7. 



Colus spitzbergensis Morris, 1947, p. 153, pi. 36, fig. 8; 1951, p. 202, pi. 36, fig. 8; 

 1952, p. 126, pi. 29, fig. 5.— Abbott, 1954, p. 229, fig. 51h. 



Eleven specimens, at least 9 of which were living, were collected: 

 2 from 125 feet, 1 from 152 feet, 1 from 217 feet, 1 from 341 feet, 2 

 from 420 feet, 2 from 438 feet, and 1 from 522 feet. The largest, 

 from 522 feet, measm'es 64.7 mm. in height by 29.2 mm. in diameter; 

 the smallest, from 217 feet, is 11.7 mm. in height. 



The periostracum of the posterior whorls of these sheUs is largely 

 worn off and often the cords are partially eroded away. The grooves 

 between the cords are usually occupied by several species of foramin- 

 ifers, bryozoans, and young barnacles. 



